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Using a Schematron approach might be appropriate
in this case. Depending upon how arbitrary the
grouping is, it may be a more practical means
as opposed to permuting all the possible groupings.
Basically, XSLT templates are used to apply integrity
constraints written as XPath expressions. The loosely coupled
tests which result can flexibly apply across multiple
structures in ways which are not practical to implement
using a syntax such as W3 Schema. It isn't an either-or
scenario: schemas can be combined with schematron too.
A better explanation is at
http://www.topologi.com/public/Schtrn_XSD/Paper.html
See also
http://www.topologi.com/products/validator/index.html
- Mitch
Hunsberger, Peter wrote:
> I'm new to XML schema and am confused on how I would create a schema that
> introduces a set of arbitrary grouping for a set of elements. For example:
>
> <x>
> <a/>
> <b/>
> <c/>
> <d/>
> <e/>
> <f/>
> </x>
>
> or
>
> <x>
> <group>
> <a/>
> <b/>
> </group>
> <c/>
> <group>
> <d/>
> <e/>
> <f/>
> </group>
> </x>
>
> or perhaps
>
> <x>
> <a/>
> <group>
> <b/>
> <c/>
> <d/>
> </group>
> <e/>
> <f/>
> </x>
>
> would all be considered valid. Additional constraints are that any number
> of groups can occur, but the elements a through f can each only occur a
> maximum of once inside the x element whether they are children of a group or
> not.
>
> Peter Hunsberger
>
>
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